JPS54158145A - Power amplifier circuit - Google Patents

Power amplifier circuit

Info

Publication number
JPS54158145A
JPS54158145A JP6677978A JP6677978A JPS54158145A JP S54158145 A JPS54158145 A JP S54158145A JP 6677978 A JP6677978 A JP 6677978A JP 6677978 A JP6677978 A JP 6677978A JP S54158145 A JPS54158145 A JP S54158145A
Authority
JP
Japan
Prior art keywords
transistor
voltage
base
output
becomes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6677978A
Other languages
Japanese (ja)
Inventor
Fujio Machida
Kazuya Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6677978A priority Critical patent/JPS54158145A/en
Publication of JPS54158145A publication Critical patent/JPS54158145A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To lessen the occurrence of the pop tone by driving the next-step A-class amplifier circuit when the base voltage of the input side of the differential paired transistor becomes less than the fixed level at the ON-time of the power source. CONSTITUTION:When the power source is switched on in case the base voltage of differential paired input side transistor 5 is approximate to the forward voltage, the base voltage of paired transistor 6 becomes double the forward voltage via voltage V2. Transistor 11 lowers output 53 owing to supply of the current to the base of transistor 10. When the base voltage of transistor 5 becomes over double the forward voltage, the current begins to flow to transistor 6. Thus, transistor 11 is cut off, and output 35 increases up. Output 35 becomes steady when no difference of potential exists between capacitors 52 and 49. As the base potential of the differential paired transistors differ near the forward voltage, the pop tone is caused by the repetitive ON and OFF. This pop tone, however, can be lessened owing to steady output 53.
JP6677978A 1978-06-05 1978-06-05 Power amplifier circuit Pending JPS54158145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6677978A JPS54158145A (en) 1978-06-05 1978-06-05 Power amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6677978A JPS54158145A (en) 1978-06-05 1978-06-05 Power amplifier circuit

Publications (1)

Publication Number Publication Date
JPS54158145A true JPS54158145A (en) 1979-12-13

Family

ID=13325687

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6677978A Pending JPS54158145A (en) 1978-06-05 1978-06-05 Power amplifier circuit

Country Status (1)

Country Link
JP (1) JPS54158145A (en)

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